• LONGVISTA

    Flow Meters

    Accurate and reliable flow meters for measuring liquid and gas flow in industrial processes, HVAC systems, water treatment, and automation applications.

Reliable flow measurement for conductive liquids in water treatment and industrial applications.

Versatile and maintenance-free, ideal for wastewater, slurry, and chemical flow monitoring.

Non-invasive flow measurement with clamp-on sensors—no pipe cutting required.

Lightweight, battery-powered solution for temporary flow testing and field diagnostics.

Radar-based, highly accurate meter for open channels, tanks, and extreme environments.

Ideal for steam, gas, and liquids in HVAC, boilers, and process industries.

High-precision turbine meter for water, solvents, and low-viscosity liquids.

Robust and accurate flow meter designed for diesel and fuel transfer systems.

Direct mass flow measurement for chemical, food, and fuel dosing with high accuracy.

Efficient gas flow monitoring for HVAC, compressed air, and nitrogen systems.

Compact and cost-effective for small pipeline liquid flow measurement.

Accurate positive displacement meter for viscous fluids like oil and syrup.

Resistant to dirt and vibration—ideal for irregular or harsh flow conditions.

Flow Meters for Liquid, Gas & Steam Applications

Our comprehensive selection of flow meters is engineered to meet the diverse needs of fluid measurement in various industrial, commercial, and municipal settings. From electromagnetic water flow meters and ultrasonic clamp-on meters to Coriolis mass flow meters and thermal gas flow meters, we provide accurate and reliable solutions for monitoring water, fuel, steam, chemicals, and compressed air.

Whether you’re dealing with non-contact flow measurement, high-viscosity liquids, or gases in pipelines, our flow meters are designed for easy installation, robust performance, and low maintenance. With models tailored to portable, inline, and clamp-on applications, we support a wide range of industries including HVAC, oil & gas, food and beverage, chemical processing, and water treatment.

Common Applications:

  • Water distribution and treatment plants
  • Industrial process control
  • Compressed air and gas systems
  • Diesel and fuel consumption monitoring
  • Chemical and pharmaceutical batching
  • Energy and utility metering

FAQS

What is the flow meter used for?

A flow meter is a device used to measure the volume or mass of a fluid—liquid, gas, or steam—as it moves through a pipe or conduit. Flow meters are essential in industries such as water treatment, HVAC, oil and gas, chemical processing, and food & beverage to monitor flow rates, ensure process efficiency, and manage resource consumption.

How do you test a flow meter?

To test a flow meter, follow these general steps:

  1. Zero Calibration: Ensure the pipe is empty or in no-flow condition to check the sensor’s baseline reading.
  2. Compare Readings: Use a reference standard or calibrated flow source to compare measurements.
  3. Check Repeatability: Run multiple tests under the same conditions and verify consistent output.
  4. Verify Installation: Ensure proper mounting, straight pipe runs, and correct orientation, as errors can affect accuracy.

Special tools like flow test kits or portable ultrasonic flow meters are also used for non-intrusive verification in the field.

How is flow measured?

Flow is measured in two main ways:

  • Volumetric Flow Rate (e.g., liters per minute, cubic meters per hour): Measures the space a fluid occupies over time.
  • Mass Flow Rate (e.g., kilograms per hour): Measures the actual mass of fluid passing through a pipe.

Technologies like electromagnetic, ultrasonic, Coriolis, thermal, and vortex sensors are used depending on the fluid type and application. Sensors convert flow into electrical signals for display or control systems.

What are the different types of flowmeters?

There are several types of flow meters, each suited for specific applications:

  1. Electromagnetic Flow Meter – For conductive liquids like water and wastewater
  2. Ultrasonic Flow Meter – Non-contact type, ideal for clean or dirty liquids
  3. Coriolis Mass Flow Meter – Highly accurate for measuring mass flow of liquids and gases
  4. Thermal Mass Flow Meter – For measuring gas flow in compressed air or HVAC systems
  5. Vortex Flow Meter – Used for measuring steam or liquids with consistent flow
  6. Turbine Flow Meter – Suitable for clean, low-viscosity fluids
  7. Oval Gear Flow Meter – Designed for high-viscosity fluids like oils or syrups
  8. Target Flow Meter – For difficult fluids or changing flow conditions

Each has advantages based on accuracy, installation conditions, fluid properties, and cost.

What is the best flow meter for water applications?

Electromagnetic and ultrasonic flow meters are most commonly used for water and wastewater due to their accuracy and non-intrusive design.

Can flow meters measure gas and steam?

Yes, we offer thermal mass flow meters for gas and vortex flow meters for steam and high-temperature fluids.

 

How do I choose the right flow meter?

It depends on your medium (liquid, gas, or steam), pipe size, temperature, pressure, flow range, and whether contact or non-contact measurement is required.

 

Do you have portable flow meters?

Yes, our portable ultrasonic flow meters are ideal for temporary, spot-check flow measurements without pipe cutting or system downtime.